Speed Control Communication With The A1 Control Board - Clarke SA40 56104487 (20D) Service Manual

Service Manual – SA40

Speed Control Communication with the A1 Control Board

A1
Control Board
Main Machine
Controller
Motion Input
+ 24v
B -
Inhibit Output
Status Signal
+ 24v
Reverse Alarm
+ 24v
B -
Drive Switch Output
There are five "communication" wires that run between the
. Each wire is used to communicate a unique piece of information as listed in the following table.
Controller
A1 Control Board
Terminal
Motion Input J3-6
Inhibit Output J1-7
J3-6
RED/WHT
J1-7
RED/YEL
J3-7
ORN/BLU
J3-5
BLU/BLK
J3-3
RED/BRN
Speed Controller
Function
Terminal
Pin 6 - Brake - (B -) The
through a resistor and out of
Pin 6 - Brake - (B -)
Board
When the machine is standing still, the switch is open and the
input is "high" or 24 volts.
When the
also closes the switch on
know that the machine is moving. When the switch on
closes, the voltage on the wire drops to 0 volts.
Pin 12 - Inhibit Input The
Controller
If the Operator is not standing on the dead man switch or a
direction has not yet been selected, the switch on
be closed to
volts) at
When the dead man switch is closed and either a forward or
reverse direction has been selected, the switch on
and the signal at
Speed Controller
the go pedal is pressed.
ORN
Y1
Brake
E1 Curtis
1210 Speed
Controller
Pin 6
Brake - (B -)
Inhibit Input
Pin 12
Pin 9
Status (B -)
Pin 16
Reverse Alarm (B -)
Drive Switch Input
Pin 17
A1 Control Board
provides a positive 24-volt supply
A1 Control Board
Motion Input J3-6
in the
Speed Controller
monitors the voltage on the wire between
operates the wheel drive motor, it
Speed Controller
Pin 6
uses the inhibit signal to tell the
A1 Control Board
when it is OK to propel the machine.
. The
B - Speed Controller
.
Pin 12
becomes high (24 volts) to signal the
Pin 12
that is it now Ok to propel the machine when
Wheel System - Traction
B+ B+ B-
+ 24v
BLK
B-
+ 24v
and the
E1 Curtis 1210 Speed
to a switch on
. The
A1 Control
and
J3-6
to to let the
B - A1 Control Board
Pin 6
Speed
will
J1-7
will see a low signal (0
J1-7
110
.
Pin 6
opens